Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details

Impairments (Details) (USD $) In Millions	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended
Impairments (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 Wind Turbines And Deposits [Member]	Sep. 30, 2010 Wind Turbines And Deposits [Member]	Sep. 30, 2011 Wind Turbines And Deposits [Member]	Sep. 30, 2010 Wind Turbines And Deposits [Member]	Sep. 30, 2011 Carbon Reduction Projects [Member]	Sep. 30, 2010 Carbon Reduction Projects [Member]	Sep. 30, 2011 Carbon Reduction Projects [Member]	Sep. 30, 2010 Carbon Reduction Projects [Member]	Sep. 30, 2011 Kelanitissa [Member]	Jun. 30, 2011 Kelanitissa [Member]	Sep. 30, 2010 Kelanitissa [Member]	Sep. 30, 2011 Kelanitissa [Member]	Sep. 30, 2010 Kelanitissa [Member]	Sep. 30, 2011 Southland Huntington Beach Subsidiary [Member]	Sep. 30, 2010 Southland Huntington Beach Subsidiary [Member]	Sep. 30, 2011 Southland Huntington Beach Subsidiary [Member]	Sep. 30, 2010 Southland Huntington Beach Subsidiary [Member]	Sep. 30, 2011 Tisza I I Subsidiary [Member]	Sep. 30, 2010 Tisza I I Subsidiary [Member]	Sep. 30, 2011 Tisza I I Subsidiary [Member]	Sep. 30, 2010 Tisza I I Subsidiary [Member]	Sep. 30, 2010 Deepwater Subsidiary [Member]	Sep. 30, 2011 Argentina Distribution And Generation Businesses [Member]	Sep. 30, 2011 Other Impairment [Member]	Sep. 30, 2010 Other Impairment [Member]	Sep. 30, 2011 Other Impairment [Member]	Sep. 30, 2010 Other Impairment [Member]	Sep. 30, 2011 Chigen [Member]
Asset Impairment Expense [Line Items]
Asset Impairment Charges	$ 163	$ 296	$ 196	$ 297		$ 116	$ 0	$ 116	$ 0	$ 33	$ 0	$ 33	$ 0	$ 4	$ 33	$ 0	$ 37	$ 0	$ 0	$ 200	$ 0	$ 200	$ 0	$ 85	$ 0	$ 85			$ 10	$ 11	$ 10	$ 12
Impairment losses	17	18	17	18																							18						17
Fair Value						45		45		11		11			33					88		88		75		75	0						0
Carrying Amount						161		161		49		49		66			66			288		288		160		160	18	317					17
Foreign currency translation adjustment	$ 2,002		$ 2,002		$ 1,824																							$ (208)